OK, without having gone back to re-read all your posts, a couple more thoughts:

What is your priority? Having more control over the day-to-day operations, with less "interference" from your parents? Having an equity stake in the ownership of the company and its assets? Or getting paid what you think you are worth? Certainly all three can go hand-in-hand, but they might also be separable issues.

On the getting paid what you think you are worth question, do you really know what you are worth? Have you actually tested your worth in the market and talked to other potential employers? This would definitely be a sure way to get your old man's attention, only you could judge whether it would be for the good or the bad!

On the equity question, why not buy it? Just insist on seller financing at a reasonable rate! If it is a good profitable business, you should be able to make the payments, right? Work up a business plan that shows how it would work and make a proposal. This would be a way to meet your parent's retirement income needs -- they live off the loan payments you are making rather than income from investments they make with the proceeds of the sale of the business. If they actually believe in the business they have built, and have confidence in your ability to run it, then this might actually be a better investment for them than investing in the stock market.

On the control of operations question, have you demonstrated interest in all aspects of the business, including the backend accounting, finances, taxes, etc... both short and long-term? Are you really prepared to take over the business in its entirety? Maybe some of the reluctance comes from your Dad's thinking that you don't yet know all that you really need to know (in his mind) in order to take over. Perhaps coming up with the business plan for how you would buy him out (see above) could help him see that you really are ready.

Again, I haven't re-read all your posts, so I hope you don't take offense (no insults intended!) Just asking questions that might help in looking at the transition from all perspectives (it's your Dad's perspective that counts, so you really want to try to understand what his issues and concerns are).